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x + 2y + z = -4 ..... 2
6x + z = -5 ............3
jawaban :
dari 3 :
z = - 5 - 6x ............4
dari 1 - 2 :
x - y = 1
x = 1 + y ..............5
substisusikan 4 dan 5 ke 2
(1 + y) + 2y + (- 5 - 6x) = - 4
1 + y + 2y - 5 - 6x = - 4
- 6x + 3y - 4 = - 4 ...........6
substisusikan 5 ke 6
-6(1 +y) +3y - 4 = - 4
-6 - 6y + 3y -4 = - 4
-3y - 10 = -4
-3y = 6
y = - 2 ............. 7
substisusikan 7 ke 5
x = 1 + (-2)
x = -1 ..............8
substisusikan 8 ke 4
z = - 5 - 6(-1)
z = - 5 + 6
z = 1............ 9
Jadi hasil yang diperoleh :
x = -1
y = -2
z = 1